flue heat exchanger



Aug. 16, 1949. w. E. RYAN 2,479,413

FLUE HEAT EXCHANGER 2 Sheets-Sheet 1 Filed Oct. 7, 1947 Inventor Attorneys Aug. 16, 1949. w. E. RYAN FLUE HEAT EXCHANGER '2 Sheets-Sheet 2 Filed Oct. '7, 1947 Ime11t0r William Edwin Ryan W Attormeys clamping bolts 40, and these clamps are concave to fit over the beads 34 and to tightly engage the same when the bolt is tightened. A plurality of spacer members 42 are secured by any suitable meanswithin the sheath 32 and arranged to space the flue members 44 from'the sheath 32. These flue members are each constructed, in the modification which will be first described, of arcuately corrugated sections of tubular material, substantially coextensive with the sheath 32 and having reduced end portions 46 which are cylindrical in form.

These cylindrical end portions 46 are similarly provided with beads 48 which are clamped together by split annular straps 50 of similar construction to the construction of the clamps 36 already described. One end of one of the cylindrical portions on each section 44 is. further reduced in diameter, as indicated at 52, to fit within the end of the adjacent cylindricalmember 46. The corrugated form of the flue sections 44 is best illustrated at 54 in Figures 4 and 5.

. An elbow, generally indicated at 56 is constructed according to the principles of construction of the sections 22, except that the external sheath 58 and the corresponding flue member 44 is similarly bent, ordinarily at a right angle, and these elbow sections are secured to the straight sections in the same manner as that already decribed. A vented section generally indicated at 60 may be constructed, as illustrated in Figure 1, with similar attachment means at one end thereof and an inwardly turned lip flange 62 to contact the'flue section 64 of simple cylindrical design.

This flue section 64 may have attachment means at one end thereof similar to that already described and the other end of this section will ordinarily be adapted for connection to a chimney flue. 'The sheath portion of the section 60 is provided with a vent 66 having a bead 68 corresponding to the bead34, sothat othersections of tubular character similar to "the sheath portion 32 may be connected to the vent 66 when it is desired to communicate this vent with an area remote from this portion or the heat exchanger.

" In a modified form of this invention the flue sections are constructed with terminal cylindrical tube portions 70 provided with bead attachment members 12 corresponding to the bead 34 and a plurality of cylindrical" tubular members 14' arranged in radially oifset relation between the cylindrical tubular members 10 and terminally secured to inclined'annular plate members 16 which are apertured as at 18 to allow communication between each of these tubular members 14 and the interior of the cylindrical end members 70. It should becarefully noted that the inclined annular plate 16 communicates with acenter tube 80. The tubes '14 are secured by spacer members 82 to a sheath 32 constructed in a manner already described.

Theoperation of this invention will be clearly understood from-the foregoing description of the mechanical details thereof, taken in connection with the above recitation of the objects sought to be achieved by this invention and, in recapitulation, it need only be added that the combustion gases :will flow upwardly from the combustion chamber inthe heater I0 to what has been described above as theflue sections, these sections being of course, heated bythese gases. In the preferred embodiment of this invention, the fan 26 is operated air will be drawn in through the vent 66 and downwardly through the space provided between the flue sections and the'sheath sections 32 into the depending portion 24 and into the air heating chamber of the circulatory heater, and thence into the room which it is desired to heat. When it is desired to delete the fan 26 and the motor 28, thebottom of the depending portion 24 is opened'as illustrated in Figure 1 and air is drawn into the lower open end of the portion 24 and moves upwardly by convection between the flue sections and the sheath sections 32, to be expelled from the vent 66. It is thus seen that this invention may be used in two ways, the otherwise wasted heat from the fiue being utilized in either case.

Obviously many minor variations may be made in the detailed construction and proportionment of the various elements of this invention, and though there has been shown a particular embodiment of this invention, this application is not limited to this particular embodiment, but it is desired-to include in the scope of this invention the construction, combination and arrangement of parts and portions substantially as set forth in the appended claims.

Having described the inventiomwhat is claimed as new is: y

1. ,A flue and heatexchanger assembly comprising a, heated flue,. a sheath secured to said flue in spaced relation thereto, an inlet and an outlet in said sheath spaced apart longitudinally, said flue being a smokeiflue con'nected'to astove, and said flue having transverselyv arcuate portions, whereby the areas of the internal and external surfaces of said flue are increased for exposure to separate streams of gases, said flue and said sheath being constructed in sections, the ends of the sections having annular beads, and annular band clamps securing juxtaposed beads together, the ends of said flue sections being reduced in dimension to increase the space between said flue and sheath adjacent said ends.

2. A flue and heat exchanger assembly comprising a, heated flue, a sheathsecured to said flue in spaced relation thereto, an inlet and an outlet in said sheath spaced apart longitudinally,

r said flue being a smoke flue connected to a stove,

and said flue having transversely arcuate portions, whereby the areas :of the internal and external surfaces of said flue are increased for exposure to separate streams of gases, said flue and said sheathbeing constructed in sections, the ends of the sectionshaving annular. beads, and annular band clamps securing juxtaposed beads together, the ends of said flue sections being reduced in dimension to increase the space between said flue and sheath adjacent. said ends, said flue sections being longitudinallycoextensive. ,y

' WILLIAM EDWINRYAN.

REFERENoEs CITED The following references are of. record in the file of this patent; I

UNITEDSTATES PA'I'ENTS 65 Number Name Date 62,183 Clifford Feb. 19, 1867 131,875 Hall J Oct. 1,1872 145,237 Proudfoot Dec. 2, 1873 167,129 Skinner Aug. 24, 1875 221,750 3 Suman Nov. 18, 1879 984,086 Graham Feb. 14, 1911 1,633,201 Swett June 21, 1927 1,797,909 Ellsdorf 1 Mar. 24, 1931 2,084,408 Mueller June 22, 1937 2,445,102 Benn 1 July 13,1948 

